<template>
    <div class="shopcart">
        <div class="content">
            <div class="content-left" @click="toggleList">
                <div class="logo-wrapper">
                    <div class="logo" :class="{'highlight':totalCount>0}">
                        <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
                    </div>
                    <div class="num" v-show="totalCount>0">{{totalCount}}</div>
                </div>
                <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
<!--                <div class="desc">另服务费￥{{deliveryPrice}}元</div>-->
                <div class="desc">快撑满你的购物车吧</div>
            </div>
            <div class="content-right" @click="pay">
                <div class="pay" :class="payClass">
                    {{payDesc}}
                </div>
            </div>
        </div>
        <div class="ball-container">
            <div v-for="(ball,index) in balls" :key="index">
                <transition
                        name="drop"
                        @before-enter="dropBeforeEnter"
                        @enter="dropEnter"
                        @after-enter="dropAfterEnter"
                >
                    <div v-show="ball.show" class="ball">
                        <div class="inner inner-hook">+</div>
                    </div>
                </transition>
            </div>
        </div>
        <transition name="fold">
            <div class="shopcart-list" v-show="listShow">
                <div class="list-header">
                    <h1 class="title">购物车</h1>
                    <span class="empty" @click="empty">清空</span>
                </div>
                <div class="list-content" ref="list-content">
                    <ul>
                        <li class="food border-1px" v-for="(food,index) in selectFoods" :key="index">
                            <span class="name">{{food.name}}</span>
                            <div class="price">
                                <span>￥{{food.price*food.count}}</span>
                            </div>
                            <div class="cartcontrol-wrapper">
                                <cartcontrol @cart-add="drop" :food="food"></cartcontrol>
                            </div>
                        </li>
                    </ul>
                </div>
            </div>
        </transition>
        <transition name="list-mask">
            <div class="list-mask" v-show="listShow" @click="toggleList"></div>
        </transition>
    </div>
</template>

<script type="text/ecmascript-6">
    import cartcontrol from "../cartcontrol/cartcontrol";
    import BScroll from 'better-scroll';

    export default {
        components: {cartcontrol},
        props: {
            selectFoods: {
                type: Array,
                default() {
                    return [];
                }
            },
            deliveryPrice: {
                type: Number,
                default: 0
            },
            minPrice: {
                type: Number,
                default: 0
            }
        },
        data() {
            return {
                balls: [
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false},
                    {show: false}
                ],
                ballIndex: 0,
                dropBalls: [],
                fold: false
            };
        },
        computed: {
            totalPrice() {
                let total = 0;
                this.selectFoods.forEach((food) => {
                    total += food.price * food.count;
                });
                return total;
            },
            totalCount() {
                let count = 0;
                this.selectFoods.forEach((food) => {
                    count += food.count;
                });
                return count;
            },
            payDesc() {
                if (this.totalPrice === 0) {
                    return `满${this.minPrice}元即可下单`;
                } else if (this.totalPrice < this.minPrice) {
                    let diff = this.minPrice - this.totalPrice;
                    return `还差${diff}元即可下单`;
                } else {
                    return '去结算';
                }
            },
            payClass() {
                if (this.totalPrice < this.minPrice) {
                    return 'not-enough';
                } else {
                    return 'enough';
                }
            },
            listShow() {
                if (this.totalCount === 0) {
                    // eslint-disable-next-line vue/no-side-effects-in-computed-properties
                    this.fold = false;
                    return false;
                } else {
                    return this.fold;
                }
            }
        },
        methods: {
            drop(el) {
                let ball = this.balls[this.ballIndex];
                ball.el = el;
                ball.show = true;
            },
            toggleList() {
                if (!this.totalCount || this.totalCount === 0) {
                    return;
                }
                this.fold = !this.fold;
                if (!this.scroll) {
                    this.scroll = new BScroll(this.$refs['list-content'], {
                        click: true
                    })
                } else {
                    this.scroll.refresh();
                }
            },
            empty() {
                this.selectFoods.forEach((food) => {
                    food.count = 0;
                })
            },
            pay() {
                if (this.totalPrice < this.minPrice) {
                    return;
                }
                // alert(`需要支付￥${this.totalPrice}元`);
                // eslint-disable-next-line no-console
                // console.log(this.selectFoods);
                this.$emit('pay')
            },
            dropBeforeEnter(el) {
                let ball = this.balls[this.ballIndex++];
                if (this.ballIndex === this.balls.length) {
                    this.ballIndex = 0;
                }
                this.dropBalls.push(ball);
                let rect = ball.el.getBoundingClientRect();
                let x = rect.left - 32;
                let y = -(window.innerHeight - rect.top - 30);
                el.style.display = '';
                el.style.webkitTransform = `translate3d(0,${y}px,0)`;
                el.style.transform = `translate3d(0,${y}px,0)`;
                let inner = el.getElementsByClassName('inner-hook')[0];
                inner.style.webkitTransform = `translate3d(${x}px,0,0) rotate(0deg)`;
                inner.style.transform = `translate3d(${x}px,0,0) rotate(0deg)`;
            },
            dropEnter(el) {
                // eslint-disable-next-line no-unused-vars
                let rf = el.offsetHeight;
                this.$nextTick(() => {
                    el.style.webkitTransform = 'translate3d(0,0,0)';
                    el.style.transform = 'translate3d(0,0,0)';
                    let inner = el.getElementsByClassName('inner-hook')[0];
                    inner.style.webkitTransform = 'translate3d(0,0,0) rotate(720deg)';
                    inner.style.transform = 'translate3d(0,0,0) rotate(720deg)';
                });
            },
            dropAfterEnter(el) {
                let ball = this.dropBalls.shift();
                ball.show = false;
                el.style.display = 'none';
            }
        }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
    @import "../../../common/stylus/mixin.styl"

    .shopcart
        position fixed
        left 0
        bottom 0
        z-index 50
        width 100%
        height 48px
        background black

        .content
            display flex
            background #141d27
            font-size 0
            color rgba(255, 255, 255, 0.4)

            .content-left
                flex 1

                .logo-wrapper
                    display inline-block
                    position relative
                    top -10px
                    margin 0 12px
                    padding 6px
                    width 56px
                    height 56px
                    box-sizing border-box
                    vertical-align top
                    border-radius 50%
                    background #141d27

                    .logo
                        width 100%
                        height 100%
                        border-radius 50%
                        background #2b343c
                        text-align center

                        &.highlight
                            background rgb(0, 160, 220)

                        .icon-shopping_cart
                            line-height 44px
                            font-size 24px
                            color #80858a

                            &.highlight
                                color #fff

                    .num
                        position absolute
                        top 0
                        right 0
                        width 24px
                        height 16px
                        line-height 16px
                        text-align center
                        border-radius 16px
                        font-size 9px
                        font-weight 700
                        color #fff
                        background rgb(240, 20, 20)
                        box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)

                .price
                    display inline-block
                    vertical-align top
                    margin 12px
                    line-height 24px
                    padding-right 12px
                    box-sizing border-box
                    border-right 1px solid rgba(255, 255, 255, 0.1)
                    font-size 16px
                    font-weight 700

                    &.highlight
                        color #fff

                .desc
                    display inline-block
                    vertical-align top
                    margin 12px 0 0 12px
                    line-height 24px
                    font-size 10px

            .content-right
                flex 0 0 105px
                width 105px

                .pay
                    height 48px
                    line-height 48px
                    text-align center
                    font-size 12px
                    font-weight 700

                    &.not-enough
                        background #2b333b

                    &.enough
                        background #00b43c
                        color #fff

        .ball-container
            .ball
                position fixed
                left 32px
                bottom 22px
                z-index 200
                transition all 0.6s cubic-bezier(0.49, -0.29, 0.75, 0.41)

                .inner
                    width 20px
                    color #fff
                    font-size 20px
                    height 20px
                    line-height 20px
                    text-align center
                    border-radius 50%
                    background rgb(0, 160, 220)
                    transition all 0.6s linear

        .shopcart-list
            position absolute
            top 0
            left 0
            z-index -1
            width 100%
            transition all 0.2s
            transform translate3d(0, -100%, 0)

            &.fold-enter-active, &.fold-leave-active
                transform translate3d(0, -100%, 0)

            &.fold-enter, &.fold-leave-to
                transform translate3d(0, 0, 0)

            .list-header
                height 40px
                line-height 40px
                padding 0 18px
                background #f3f5f7
                border-bottom 1px solid rgba(7, 17, 27, 0.1)

                .title
                    float left
                    font-size 14px
                    color rgb(7, 17, 27)

                .empty
                    float right
                    font-size 12px
                    color rgb(0, 160, 220)

            .list-content
                padding 0 18px
                max-height 300px
                overflow hidden
                background #fff

                .food
                    position relative
                    padding 12px 0
                    box-sizing border-box
                    border-1px (rgba(7, 17, 27, 0.1))

                    .name
                        line-height 24px
                        font-size 14px
                        color rgb(7, 17, 27)

                    .price
                        position absolute
                        right 90px
                        bottom 12px
                        line-height 24px
                        font-size 14px
                        font-weight 700
                        color rgb(240, 20, 20)

                    .cartcontrol-wrapper
                        position absolute
                        right 0
                        bottom 6px


        .list-mask
            position fixed
            top 0
            left 0
            width 100%
            height 100%
            z-index -10
            background rgba(7, 17, 27, 0.6)
            transition all 0.2s

            &.list-mask-enter-to, &.list-mask-leave
                opacity 1
                background rgba(7, 17, 27, 0.6)

            &.list-mask-enter, &.list-mask-leave-to
                opacity 0
                background rgba(7, 17, 27, 0)

</style>
